CVE-2024-50001
Vulnerability from cvelistv5
Published
2024-10-21 18:02
Modified
2024-12-19 09:31
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix error path in multi-packet WQE transmit Remove the erroneous unmap in case no DMA mapping was established The multi-packet WQE transmit code attempts to obtain a DMA mapping for the skb. This could fail, e.g. under memory pressure, when the IOMMU driver just can't allocate more memory for page tables. While the code tries to handle this in the path below the err_unmap label it erroneously unmaps one entry from the sq's FIFO list of active mappings. Since the current map attempt failed this unmap is removing some random DMA mapping that might still be required. If the PCI function now presents that IOVA, the IOMMU may assumes a rogue DMA access and e.g. on s390 puts the PCI function in error state. The erroneous behavior was seen in a stress-test environment that created memory pressure.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26fad69b34fcba80d5c7d9e651f628e6ac927754Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2bcae12c795f32ddfbf8c80d1b5f1d3286341c32Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8bb8c12fb5e2b1f03d603d493c92941676f109b5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca36d6c1a49b6965c86dd528a73f38bc62d9c625Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ce828b347cf1b3c1b12b091d02463c35ce5097f5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ecf310aaf256acbc8182189fe0aa1021c3ddef72Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc357e78176945ca7bcacf92ab794b9ccd41b4f4Patch
Impacted products
Vendor Product Version
Linux Linux Version: 5.10
Show details on NVD website

To clipboard 

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    "dateReserved": "2024-10-21T12:17:06.058Z",
    "dateUpdated": "2024-12-19T09:31:02.695Z",
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Si bien el c\u00f3digo intenta manejar esto en la ruta debajo de la etiqueta err_unmap, desasigna err\u00f3neamente una entrada de la lista FIFO de asignaciones activas del sq. Dado que el intento de asignaci\u00f3n actual fall\u00f3, esta desasignaci\u00f3n est\u00e1 eliminando alguna asignaci\u00f3n DMA aleatoria que a\u00fan podr\u00eda ser necesaria. Si la funci\u00f3n PCI ahora presenta ese IOVA, el IOMMU puede asumir un acceso DMA no autorizado y, por ejemplo, en s390 pone la funci\u00f3n PCI en estado de error. 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  }
}


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